With the federated model, someone can host whatever they want on peertube, and there's almost nothing you can do about it (just like any website). The idea is

With the federated model, someone can host whatever they want on peertube, and there's almost nothing you can do about it (just like any website). The idea is that you join or self host some home server, and the admin of that server makes sure to only show content from decent sources. To this end the admins have a few tools. They choose the list of servers to show new videos from in the publicly available lists ("new videos" etc). So these will come from servers with a history of good moderation. As a user, you can also subscribe to content from servers not specifically approved by the admin. If the admin finds it really offensive they can block that also. Then, as a user, you need to either give up on that content or find a different home server. Obviously an admin is also responsible for the content they themselves host.